Louis Ducruet and Marie Chevallier Now moving on to the royals of Monaco! In February, Princess Stéphanie, whose parents are the late Prince Rainier III and Grace Kelly, announced that her son popped the question to his college girlfriend. While the couple have yet to set a date, the wedding will mark the first for any of Stéphanie's children. She is also mother to 23-year-old daughter Pauline and 19-year-old daughter Camille. Image Source: Getty / Tony Barson